A Projectile Is Fired Over a Horizontal Surface at an Angle

Multiple Choice

A projectile is fired over a horizontal surface at an angle of elevation of 70°. Neglecting air resistance, what are possible angles in flight between the acceleration vector and the velocity vector?

A) 170 $\degree$ and 40 $\degree$
B) 120 $\degree$ and 70 $\degree$
C) 90 $\degree$ and 15 $\degree$
D) none of the above